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trace_state.go
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/
trace_state.go
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//
// Copyright 2022 SkyAPM org
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package go2sky
import (
"sync/atomic"
)
var (
globalTracer = &atomic.Value{}
)
// SetGlobalTracer registers `tracer` as the global Tracer.
func SetGlobalTracer(tracer *Tracer) {
globalTracer.Store(tracer)
}
// GetGlobalTracer returns the registered global Tracer.
// If none is registered then an instance of `nil` is returned.
func GetGlobalTracer() *Tracer {
value := globalTracer.Load()
if value != nil {
if tracer, ok := value.(*Tracer); ok {
return tracer
}
}
return nil
}